   body{
     background-color: aliceblue;
   }

   /**header**/
    .header {
        display: block;
        position: fixed;
        left: 0px;
        top: 0px;
        right: 0px;
        height: 40px;
    line-height: 40px;
        background: aquamarine;
        font-size: 15px;
        color: #555;
        z-index: 2;
    }

    
/**content**/
.content {
    position: absolute;
    top: 40px;
    overflow: auto;
    height: 87%;
    width: 100%;
}

.content .c_body {
    margin: 0px 15px;
    padding: 8px 0px;
}

.c_body .c_ul_li{
    margin-bottom: 10px;
    display: block;
}

.c_body .c_ul_li .l_pic{
   float: left;
}
.c_ul_li .l_pic>img{
    width: 30px;
    height: 30px;
    border-radius: 50%;
    object-fit: cover;
}
.c_body .c_ul_li .l_pic_right{
    float: right;
}




.c_body .c_ul_li .l_content{
    float: left;
    margin:0px 2px;
    max-width: 76%;
    padding: 9px;
    background-color: #66b1ff47;
    border-radius: 9px;
    font-size: 13px;
    text-align: justify;
    letter-spacing: 1px;
    word-spacing: 1px;
}


/**footer**/
.footer {
    display: block;
    position: absolute;
    left: 0px;
    bottom: 0px;
    right: 0px;
    min-height: 80px;
    font-size: 15px;
    color: #555;
}

.footer .f_body .f_msg {
    padding: 2px 9px;
}
.footer .f_body .f_msg>textarea{
    width: 96%;
    padding: 2px;
    height: 20px;
    font-size: 14px;
    border: none;
    background-color: #fff;
}
.footer .f_body .f_opertion{
    display: flex;
    padding: 13px 0px;
    justify-content: space-around;
    text-align: center;
    background-color: #f4f4f5;
}